Improvement in gas-meters



W. A. TELLING 81. S. JOHNSON.

'Gas Meters.

Fig.2.

Patented September 30,1873

Fig-.3.

. 22 2 am a INVENTORS:

WITNESSES:

J m/pr UNITED STATES PATENT OFFICE.

WILLIAM TELLING AND SAMUEL JOHNSON, OF WOOD GREEN, LON- DON, ASSIGNORSTO THE IMPERIAL METER COMPANY, OF LONDON,

ENGLAND.

IMPROVEMENT IN GAS-METERS.

Specification forming part of Letters Patent No. [43,390, datedSeptember 30, 1873; application filed July 7,1873.

To all whom it may concern Be it known that we, WILLIAM ALFRED TELLINGand SAMUEL JoHNsoN, both of Wood Green, London, England, have inventedImprovements in Gas-Meters; and we do hereby declare that the followingis a full, clear, and exact description thereof, reference being had tothe accompanying drawing making part'of this specification, in whichFigure 1 is a longitudinal section of a gasmeter embodying ourinvention. Fig. 2 is a transverse section, and Fig. 3 a horizontalsection, of the same. Fig. 4 is a transverse section of part of themeter, through the slidevalve by which the passage of the gas isregulated.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to novel improvements in that form of gas-meterknown as the dry meter, in which the quantity of gas passing through itis measured by the alternate expansion and contraction of a flexiblediaphragm formed of thin leather or other suitable material. The objectsof our invention are to simplify the construction of such gas-meters, toapply a balance-weight to the flexible diaphragm, bymeans of which theflow of gas is rendered more equable, to reduce the friction upon theparts of the apparatus which drive the regulating-valve and theregistering apparatus.

In the accompanying drawing, a represents the body of a meter, dividedby the plate 1) into the .upper part c and the lower part (I, and thepart 61 is itself divided into two parts (which may be equal or unequal)by the plate 0, to which the edge of thefiexible diaphragm or bag f,Fig. 2, is attached. The vertical wire or spindle d is connected to thediaphragm f by means of connecting-links between the arm hand the platei, and its upper part passes through the stuffing-box k in the plate I),and carries the arm Z, at the end of which is fixed the screw n, uponwhich the pins m m are adjusted. These pins maybe fitted withfrictionrollers, preferably of glass. The rocking-shaft 0 carries theweighted lever 10, which is thrown over from side to side by the pins mm as they travel backward and forward by the movement of the diaphragmf. The part of the weighted lever 10 which is struck by the pins is madeof a curved or cycloidal shape, as

shown at a, Fig. 2, in order to reduce its down ward pressure upon thepins m m. One end of the rocking-shaft 0 passes through the stuffing-box8 into the separate chamber t, to which municate, respectively, with thetwo parts into which the meter is divided by the plate 6 and thediaphragm f, and the gas is admitted into them alternately by the actionof the slidevalve. The stroke of the valve w is limited by the stops 12, and the movement of the weighted lever 10 is limited by the stops 3and 4 and the buffer F. In the lower part of the meter G, I t

Fig. 2, is a weightedbalance-lever turning upon a center, H, andconnected to the plate c, and the diaphragm f by the link K. L is an armor lever fixed upon the wire or spindle g, and connected by the rod M tothe pallet N, which oscillates upon the center 0, and at eachoscillation in either direction drives forward the pallet-wheel P, bywhich are driven the indices of the registering apparatus, (not shown inthe drawing,) but which may be constructed in the usual manner.

The operation of the gas-meter is as follows: The gas is admitted fromthe inlet-pipe 1; into the valve-chamber t, whence, by the action of thevalve w, it is admitted to either side of the diaphragm f alternately,and thus drives the diaphragm, and the plate iwhich covers it, from sideto side, the gas being forced during each return stroke of the diaphragmback through the valve w and the passage A to the outlet-pipe G. Thevertical cranked wire 9 being connected to the diaphragm by means of thearm h is made to make a partial revolution at each stroke of thediaphragm, andthe lever Z fixed upon its upper end thus carries backwardand forward the pins m m, which strike the weighted lever 19. When thediaphragm f is traveling in the direction shown by the arrow in Fig. 2,the pressure of the gas has not only to move the diaphragm, but also tolift the weighted balance-lever G, which is so adjusted that it hasreached its highest point at the moment when the pin m strikes theweighted lever 12, and by its subsequent descent it aids the pressure ofthe gas to lift the latter. The pins m m are so adjusted that theweighted lever 19 falls over and instantaneously reverses the action ofthe valve at the moment when the diaphragm has traveled sufficiently farto measure the exact quantity of gas required. It then instantlycommences its return stroke, during which it has to lift the weightedleverv G, which falls over at the moment that the pin m commences tolift the lever 19. The movement of the diaphragm is thus continuous andequable, and the steadiness of the escaping gas is not effected by thesudden reversal of its movements. The cycloidal curve 0" upon the lever19 reduces the friction of the pins m m upon it. The action of the leverN upon the pallet-wheel P, by movin g the latter forward at eachoscillation of the diaphragm in either direction, reduces thefrictionrequired to drive the registering apparatus.

Having now described our invention, what we claim as new, is

1. The combination, with the diaphragm in a dry gas-meter, of theweighted balance-lever G, arranged so that it assists in lifting theweighted lever 19 used for reversing the slidevalve w, and thus rendersthe action of the diaphragm continuous and equable, substantially asdescribed and shown in the drawing. 2. The combination, with the pins mm driven by the diaphragm, of the curved or cycloidal-shaped weightedlever which drives the slide-valve w, so that the downward pressure uponthe pins is reduced, substantially as described and shown in thedrawing. In testimony whereof we have signed our names to thisspecification in the presence of two subscribing witnesses.

WILLIAM ALFRED TELLING.

SAMUEL JOHNSON.

Witnesses:

EDMUND EDWARD, CHARLES JAMES WINTERSGILL.

